What correction should be made if violet is placed between red and yellow?

Correct answer: Place it between blue and red

The governing colour-wheel rule is that a secondary colour is placed between the two primary colours that create it. Violet results from mixing blue and red, so it must be located between blue and red. Yellow and blue produce green, while red and yellow produce orange. Keeping violet between red and yellow preserves the error, and replacing it with green changes the colour entirely. Hence A is correct.